[1] Chengdu Second Peoples Hosp, Dept Dermatol, Chengdu 610017, Sichuan, Peoples R China
[2] China Japan Friendship Hosp, Dept Dermatol, Beijing 100029, Peoples R China
[3] Peking Union Med Coll & Chinese Acad Med Sci, Grad Sch, Beijing 100730, Peoples R China